Subtraction With Virtual Manipulatives I would use Base Blocks Subtraction found on the National Library of Visual Manipulatives at http://nlvm.usu.edu/ to work with my class on subtraction.
M.O.2.1.10
Model 2- and 3-digit addition and subtraction with
regrouping using multiple strategies.
M.O.2.1.11
add and subtract 2- and 3-digit numbers without regrouping.
I will introduce this on the white board to the whole class. For example, I will model the problem 135 - 89. We will build 135 with a flat, 3 rods and 5 units in blue.Then I will show 8 rods and 9 units in red. Students will use base ten blocks at their seats. We will take a rod from the 3 rods and break it into 10 units.Then, on the whiteboard the students visually match the rods and units as they subtract. The renaming is shown along with the answer as the problem is completed. This site also allows the teacher to create new problems. It could be used with second graders through third grade with subtracting in hundreds or across zeros. Students in fourth through sixth graders experiencing problems could also benefit. As younger children subtract, with this manipulative, they can see the ten rod break apart into 10 units or the flat break apart into ten rods. They can't physically do this with the real minipulatives. it adds a strong visual effect for the students. Submitted by June Angle
3 Digit Subtraction with Base Blocks
I suggest using this to help teach multi-digit subtraction to 4th grade. Go to the National Library of Virtual Manipulatives http://nlvm.usu.edu, select Number and Operations, grades 3-5. Scroll down to Base Blocks Subtraction. I would begin by solving the problems already provided. I plan to use this to teach 3 digit subtraction, but would begin with 2 digit for practice and to familiarize students with the program before introducing a more difficult portion of subtraction. I would take students through the steps of borrowing from the 10s when there are not enough in the 1s place on the 2 digit problems. Once students seem to understand how the borrowing takes place, as far as breaking the 10s apart into 10 ones, I would move to 3 digit subtraction. I would the repeat the borrowing process as it pertains to borrowing from the hundreds and giving to the tens. I would be sure to make sure students understand that when they borrow they are merely breaking the 100s down into individual parts. Once students have developed some mastery over the process of subtracting three digit numbers, I would let them create their own problems in partners. They will take turns creating a solving each others problems.
Submitted by Ashlie Bailey
Constant Weight Gain Using a Calculator with First Graders
http://education.ti.com/educationportal/activityexchange/Activity.do?cid=US&aId=4954
Students will add 2's, 3's, and 4's using a calculator to determine the weight gain of baby animals at the zoo. They will make a graph to see how much weight a baby tiger gains every two weeks. The beginning weight will be determined by the teacher.
Submitted by Deanna Pottorff for 1st grade.
I would use Base Blocks Subtraction found on the National Library of Visual Manipulatives at http://nlvm.usu.edu/ to work with my class on subtraction.
regrouping using multiple strategies.
I will introduce this on the white board to the whole class. For example, I will model the problem 135 - 89. We will build 135 with a flat, 3 rods and 5 units in blue.Then I will show 8 rods and 9 units in red. Students will use base ten blocks at their seats. We will take a rod from the 3 rods and break it into 10 units.Then, on the whiteboard the students visually match the rods and units as they subtract. The renaming is shown along with the answer as the problem is completed. This site also allows the teacher to create new problems. It could be used with second graders through third grade with subtracting in hundreds or across zeros. Students in fourth through sixth graders experiencing problems could also benefit. As younger children subtract, with this manipulative, they can see the ten rod break apart into 10 units or the flat break apart into ten rods. They can't physically do this with the real minipulatives. it adds a strong visual effect for the students.
Submitted by June Angle
3 Digit Subtraction with Base Blocks
I suggest using this to help teach multi-digit subtraction to 4th grade. Go to the National Library of Virtual Manipulatives http://nlvm.usu.edu, select Number and Operations, grades 3-5. Scroll down to Base Blocks Subtraction. I would begin by solving the problems already provided. I plan to use this to teach 3 digit subtraction, but would begin with 2 digit for practice and to familiarize students with the program before introducing a more difficult portion of subtraction. I would take students through the steps of borrowing from the 10s when there are not enough in the 1s place on the 2 digit problems. Once students seem to understand how the borrowing takes place, as far as breaking the 10s apart into 10 ones, I would move to 3 digit subtraction. I would the repeat the borrowing process as it pertains to borrowing from the hundreds and giving to the tens. I would be sure to make sure students understand that when they borrow they are merely breaking the 100s down into individual parts. Once students have developed some mastery over the process of subtracting three digit numbers, I would let them create their own problems in partners. They will take turns creating a solving each others problems.
Submitted by Ashlie Bailey
Constant Weight Gain Using a Calculator with First Graders
http://education.ti.com/educationportal/activityexchange/Activity.do?cid=US&aId=4954Students will add 2's, 3's, and 4's using a calculator to determine the weight gain of baby animals at the zoo. They will make a graph to see how much weight a baby tiger gains every two weeks. The beginning weight will be determined by the teacher.
Submitted by Deanna Pottorff for 1st grade.
100 or Bust
Link to the website: http://education.ti.com/educationportal/activityexchange/activity_detail.do?cid=us&activityid=5350Math Topic: Number and Operations (place value, estimation, comparing numbers, addition and subtraction)
Modifications to Lesson: For a challenge, you can change it to 1000 or Bust.
Submitted by: Ellen Jung
Crunching Numbers
Link to the website: http://education.ti.com/educationportal/activityexchange/activity_detail.do?cid=us&activityid=4928Math Topic: Students learn to build and add two digit numbers. They connect number words and numerals.
Submitted by: Ashlie Bailey
Find more ideas at Basic Operation Lesson Ideas